C# Definition:

[StructLayout(LayoutKind.Sequential)]
internal class SYSTEM_POWER_STATUS_EX
{
   public BYTE ACLineStatus = 0;
   public BYTE BatteryFlag = 0;
   public BYTE BatteryLifePercent = 0;
   public BYTE Reserved1 = 0;
   public DWORD BatteryLifeTime = 0;
   public DWORD BatteryFullLifeTime = 0;
   public BYTE Reserved2 = 0;
   public BYTE BackupBatteryFlag = 0;
   public BYTE BackupBatteryLifePercent = 0;
   public BYTE Reserved3 = 0;
   public DWORD BackupBatteryLifeTime = 0;
   public DWORD BackupBatteryFullLifeTime = 0;
}

VB Definition:

Structure SYSTEM_POWER_STATUS_EX
   Public TODO
End Structure

User-Defined Field Types:

None.

Notes:

ACLineStatus

    AC power status. It is one of the following values. Value Description
        0 Offline
1 Online         255 Unknown status
        All other values are reserved.

    BatteryFlag
        Battery charge status. It can be a combination of the following values:
            BATTERY_FLAG_HIGH
            BATTERY_FLAG_CRITICAL
            BATTERY_FLAG_CHARGING
            BATTERY_FLAG_NO_BATTERY
            BATTERY_FLAG_UNKNOWN
            BATTERY_FLAG_LOW

    BatteryLifePercent
    Percentage of full battery charge remaining. This member can be a value in the range 0 to 100, or 255 if status is unknown. All other values are reserved.
    Reserved1
        Reserved; set to zero.
    BatteryLifeTime
        Number of seconds of battery life remaining, or 0xFFFFFFFF if remaining seconds are unknown.
    BatteryFullLifeTime
        Number of seconds of battery life when at full charge, or 0xFFFFFFFF if full lifetime is unknown.
    Reserved2
        Reserved; set to zero.
    BackupBatteryFlag
        Backup battery charge status. It can be a combination of the following values:
            BATTERY_FLAG_HIGH
            BATTERY_FLAG_CRITICAL
            BATTERY_FLAG_CHARGING
            BATTERY_FLAG_NO_BATTERY
            BATTERY_FLAG_UNKNOWN
            BATTERY_FLAG_LOW
    BackupBatteryLifePercent
        Percentage of full backup battery charge remaining. Must be in the range 0 to 100, or BATTERY_PERCENTAGE_UNKNOWN.
    Reserved3
        Reserved; set to zero
    BackupBatteryLifeTime
        Number of seconds of backup battery life remaining, or BATTERY_LIFE_UNKNOWN if remaining seconds are unknown.
    BackupBatteryFullLifeTime
        Number of seconds of backup battery life when at full charge, or BATTERY_LIFE_UNKNOWN if full lifetime is unknown.